
<template>
  <div ref="chartRef" style="height: 11vh;width: 14vh;position: relative;top: -2vh"></div>
</template>
<script setup>

const props = defineProps({
  data: Object,
})


/* 环形图 */
// 生成扇形的曲面参数方程，用于 series-surface.parametricEquation
import {onMounted, ref} from "vue";
import {drawLine} from "../../util/chartUtil.js";

function getParametricEquation(startRatio, endRatio, isSelected, isHovered, k, h) {

  // 计算
  let midRatio = (startRatio + endRatio) / 2;

  let startRadian = startRatio * Math.PI * 2;
  let endRadian = endRatio * Math.PI * 2;
  let midRadian = midRatio * Math.PI * 2;

  // 如果只有一个扇形，则不实现选中效果。
  if (startRatio === 0 && endRatio === 1) {
    isSelected = false;
  }

  // 通过扇形内径/外径的值，换算出辅助参数 k（默认值 1/3）
  k = typeof k !== 'undefined' ? k : 1 / 3;

  // 计算选中效果分别在 x 轴、y 轴方向上的位移（未选中，则位移均为 0）
  let offsetX = isSelected ? Math.cos(midRadian) * 0.1 : 0;
  let offsetY = isSelected ? Math.sin(midRadian) * 0.1 : 0;

  // 计算高亮效果的放大比例（未高亮，则比例为 1）
  let hoverRate = isHovered ? 1.05 : 1;

  // 返回曲面参数方程
  return {

    u: {
      min: -Math.PI,
      max: Math.PI * 3,
      step: Math.PI / 32
    },

    v: {
      min: 0,
      max: Math.PI * 2,
      step: Math.PI / 20
    },

    x: function(u, v) {
      if (u < startRadian) {
        return offsetX + Math.cos(startRadian) * (1 + Math.cos(v) * k) * hoverRate;
      }
      if (u > endRadian) {
        return offsetX + Math.cos(endRadian) * (1 + Math.cos(v) * k) * hoverRate;
      }
      return offsetX + Math.cos(u) * (1 + Math.cos(v) * k) * hoverRate;
    },

    y: function(u, v) {
      if (u < startRadian) {
        return offsetY + Math.sin(startRadian) * (1 + Math.cos(v) * k) * hoverRate;
      }
      if (u > endRadian) {
        return offsetY + Math.sin(endRadian) * (1 + Math.cos(v) * k) * hoverRate;
      }
      return offsetY + Math.sin(u) * (1 + Math.cos(v) * k) * hoverRate;
    },

    z: function(u, v) {
      if (u < -Math.PI * 0.5) {
        return Math.sin(u);
      }
      if (u > Math.PI * 2.5) {
        return Math.sin(u) * h * .1;
      }
      return Math.sin(v) > 0 ? 1 * h * .1 : -1;
    }
  };
}

// 生成模拟 3D 饼图的配置项
function getPie3D(pieData, internalDiameterRatio) {

  let series = [];
  let sumValue = 0;
  let startValue = 0;
  let endValue = 0;
  let legendData = [];
  let k = typeof internalDiameterRatio !== 'undefined' ? (1 - internalDiameterRatio) / (1 + internalDiameterRatio) : 1 / 3;

  // 为每一个饼图数据，生成一个 series-surface 配置
  for (let i = 0; i < pieData.length; i++) {
    sumValue += pieData[i].value;
    let seriesItem = {
      name: typeof pieData[i].name === 'undefined' ? `series${i}` : pieData[i].name,
      type: 'surface',
      parametric: true,
      wireframe: {
        show: false
      },
      pieData: pieData[i],
      pieStatus: {
        selected: false,
        hovered: false,
        k: k
      }
    };

    if (typeof pieData[i].itemStyle != 'undefined') {
      let itemStyle = {};
      typeof pieData[i].itemStyle.color != 'undefined' ? itemStyle.color = pieData[i].itemStyle.color : null;
      typeof pieData[i].itemStyle.opacity != 'undefined' ? itemStyle.opacity = pieData[i].itemStyle.opacity : null;
      seriesItem.itemStyle = itemStyle;
    }
    series.push(seriesItem);
  }

  // 使用上一次遍历时，计算出的数据和 sumValue，调用 getParametricEquation 函数，
  // 向每个 series-surface 传入不同的参数方程 series-surface.parametricEquation，也就是实现每一个扇形。
  let linesSeries = [];
  for (let i = 0; i < series.length; i++) {
    endValue = startValue + series[i].pieData.value;

    series[i].pieData.startRatio = startValue / sumValue;
    series[i].pieData.endRatio = endValue / sumValue;
    series[i].parametricEquation = getParametricEquation(series[i].pieData.startRatio, series[i].pieData.endRatio, false, false, k, series[i].pieData.value);

    startValue = endValue;
    let midRadian = (series[i].pieData.endRatio+series[i].pieData.startRatio)*Math.PI;
    let posX = Math.cos(midRadian) * (1 + Math.cos(Math.PI/2));
    let posY = Math.sin(midRadian) * (1 + Math.cos(Math.PI/2));
    let posZ = Math.log(Math.abs(series[i].pieData.value+1))*0.1;
    let flag = ((midRadian>=0&&midRadian<=Math.PI/2)||(midRadian>=3*Math.PI/2&&midRadian<=Math.PI*2))?1:-1;
    let color = pieData[i].itemStyle.color;
    let endPosArr = [posX*(1.8)+(i*0.1*flag)+(flag<0?-0.5:0),posY*(1.8)+(i*0.1*flag)+(flag<0?-0.5:0),posZ*(2)]
    linesSeries.push({
      type:'line3D',
      lineStyle:{
        color:color,
      },
      data:[[posX,posY,posZ],endPosArr]
    },{
      type:'scatter3D',
      label:{
        show:true,
        textStyle:{
          color:'transparent',
          backgroundColor:'transparent'
        },
        formatter:'{b}'
      },
      symbolSize:0,
      data:[{name:series[i].name+'\n'+series[i].pieData.value,value:endPosArr}]
    });
    // legendData.push(series[i].name);
  }
  // series = series.concat(linesSeries)

  // 补充一个透明的圆环，用于支撑高亮功能的近似实现。
  series.push({
    name: 'mouseoutSeries',
    type: 'surface',
    size: [20,20],
    parametric: true,
    wireframe: {
      show: false
    },
    itemStyle: {
      opacity: 0
    },
    parametricEquation: {
      u: {
        min: 0,
        max: Math.PI * 2,
        step: Math.PI / 20
      },
      v: {
        min: 0,
        max: Math.PI,
        step: Math.PI / 20
      },
      x: function(u, v) {
        return Math.sin(v) * Math.sin(u) + Math.sin(u);
      },
      y: function(u, v) {
        return Math.sin(v) * Math.cos(u) + Math.cos(u);
      },
      z: function(u, v) {
        return Math.cos(v) > 0 ? 0.1 : -0.1;
      }
    }
  });

  // 准备待返回的配置项，把准备好的 legendData、series 传入。
  let option = {
    //animation: false,
    legend: {
      data: legendData
    },
    tooltip: {
      formatter: params => {
        if (params.seriesName !== 'mouseoutSeries') {
          return `${params.seriesName}<br/><span style="display:inline-block;margin-right:5px;border-radius:10px;width:10px;height:10px;background-color:${params.color};"></span>${option.series[params.seriesIndex].pieData.value}`;
        }
      }
    },
    xAxis3D: {
      min: -1,
      max: 1
    },
    yAxis3D: {
      min: -1,
      max: 1
    },
    zAxis3D: {
      min: -1,
      max: 1
    },
    grid3D: {
      show: false,
      boxHeight: 30,
      viewControl: {//3d效果可以放大、旋转等，请自己去查看官方配置
        alpha: 30,
        rotateSensitivity: 0,
        zoomSensitivity: 0,
        panSensitivity: 0,
        autoRotate: true
      },
      //后处理特效可以为画面添加高光、景深、环境光遮蔽（SSAO）、调色等效果。可以让整个画面更富有质感。
      postEffect: {//配置这项会出现锯齿，请自己去查看官方配置有办法解决
        enable: true,
        bloom: {
          enable: true,
          bloomIntensity: 0.1
        },
        SSAO: {
          enable: true,
          quality: 'medium',
          radius: 2
        }
      }
    },
    series: series
  };
  return option;
}

// 传入数据生成 option
let option = getPie3D(props.data, 0.59);
let chartRef = ref();
onMounted(() => {
  drawLine(chartRef.value, option);
})
</script>
<style scoped>

</style>